Hypodermic syringe



Aug. 5, 1952 A. E. SMITH 2,605,767

HYPODERMIC SYRINGE Filed Jan. 17, 1948 INVENT OR.

Aena/PE Srv/TH BY Patented Aug. 5, 1952 UNITED STATES HYPODERMIC sYmNGE Arthur E. smith, Los Angeles, Calif.

Application January 17, 1948, Serial No. 2,900V

9 claims. Y (ol. 12s-220) This invention relates to a hypodermic syringe.

The general object of the invention isto provide an improved hypodermic syringe of the disposable type in which the parts are Vof such a nature that they can be readily manufactured and assembled. v

Another object of the invention is to provide a novel front member for a syringe.

A further object of the invention is to provide a hypodermic syringe including novel means for preventing premature or accidental movement of the parts of the syringe. l Y

Other objects and advantages of the invention will be apparent from the following description .y

Referring to the drawing by reference charv, acters, I have shown my invention as rembodied in a hypodermic syringe which is indicated generally at l. As shown the syringe is of the disposable type and includes an ampule or barrel Il' and a plunger yIl'. The barrel may be made of tubular material such as glass and has a rubber stopper I3' in kone end. The stopper-includes an axial recess I4' and an axial depression l5. with a diaphragm I6 between the recess and the The needle includes la xed hub 52 which'has a head 53' thereon, normally arranged in the recess 38. The head 53 is shown Vas beveled to correspond to the bevel 39' of the recess. The hub includes a finger engaginghead portion 55 by means of which the needle may be moved so that the head 53' passesinto the recess 31', at which timeY the" diaphragm 21 .will have been pierced by the tip Ela' of the needle. l v

I provide a cap member 65 'which serves to protect the hypodermic needleduring shipment and prior to use. This cap member hasv a' bore 66 which receives vthe needle, and-the end G'Lof the-cap-member engages thehub 55 when in normal position. To prevent premature piercing of the diaphragm 2l' by 'the :inner end of the needle, I provide a seal member, indicated generally at 68'and which may 'consistof a strip of adhesive tape 69 to which a'block 10 is secured. This block I0 may be oi. plastic material and ts between the end 1I 'of' the plunger tip and the shoulder 12 at the inner end of the hub 55' and thus prevents axial inward mo'vement of. the hub. The free end 13 Vof the seal engages the cap member 65 and includes a finger engaging releasing tab 14. The nger engaging tab "I4 may be made by Vfolding the en'd ofthe strip upon itself.;V v

The seal .member 68 further may include a 'block 15 lwhich engages theflange :30' and the end 'I6 Vof the. ampule! l I',and normally prevents depression. 'The stopper includes aange jl.

The plunger l2' includes aninnerend Vwhich is recessed at 60 to receive the bodylofa piston stopper 6| which has peripheral beads 62 thereon at the inner end thereof. The stopperii I .is preferably made of rubber and has axial recesses 25 Y member which is shaped to provide a finger engaging ange and has a bore 3l which receives the body of a front end closure 32which is preferably made of rubber and includes a rounded iront end tip 33. The closure 32 includes an inner axial recess 34' separated by a diaphragm 35 from an axial recess 36' which communicates with another axial recess 31. The recess 31 communicates with a recess 38', the inner wall of the recess 38' being beveled as at 39'. A hole 40 aiords communication between the outerV recess 38 land the end of the tip 33'. .A

The plunger I2 has an axial bore 50 inwhich I arrange a hypodermic needle 5|. Thisv needle has a sharpened tip 5P" disposed normally adjacent the diaphragm 21' and is adapted to pierce the diaphragm to place the needle in communication with the contents of the ampule when the needle is moved axially along the plunger.

upon the needle.

collapsing movement'vf the ampule andplunger.

.In use the syringe is preparedv so 'thatfitis in the condition shown -in .Fig.f1. The operator Vthengrasps thetab'd'of the 'seal andstrips away the seal, firstv re'riioi'riiigv the block 'IIJ and` thus `allowin`gth cap memberli to be pushed and l5 byA further` moving the seal'y 68.. permits the plunger'vto move into-thel ampule."

Applicants present 1 application, .Serial No.

2,900,r filed January 17, 1948, relates to a syringe wherein there is a barrel having a front member, a recess and with a needle extending through the front member and recess and-having a protuber 1 ant portion engageableY in the recess and with the needle adapted to be advanced to its seated position Vby means-of afprotectivekcap carried In applicants copending application Serial No. 1,551, filed January 10,1948, now Patent No.

2,538,391, dated January 16, 1951, the claim is closures being pierceable by the needle of a filling apparatus.

In applicants copending application Serial No.

to ;l1old protjuberance wheni vtion nethe.recess...; 41'. 'P1-syringe inclu-ding movable said:.barrel,y iront;1nemberithereon,;;sa1d front. memberfhaving 548, led January 5, 1948, now Patent No. 2,538,390, dated January 16, 1951, the claim is directed to the outer barrel with a front closure therein .andjheclaim includes the sliding barrel forming Yamplulevvitliiri the oliterfbarrel and 'with the piston closure in the sliding barrel atitsV front end. The claim also includes the piston plunger within the sliding barrel and having a piston l head thereon. .l From the foregoing description it will be apbe economically manufactured and whic heishig-,h-

ly efficient for its intended use.

.'10 parent that I have invented a syringe whichmay` 4 Y' diaphragm when the needle is moved, and releasable means normally preventing movement of the plunger in the ampule.

6. A syringe including an outer ampule member. and an inner, plunger member slidable in the outer member, "a frontclosure on one of said members, said front closure having an axial recess therein, a needle extending through said closure and having an enlargement thereon normally disposedin the recess, said front closure 'having Aa second axial recess communicating with and disposed inwardly from the first axial recess;

Having thus described my inventionf' claim:V

anzfelongated:frecess;. and .a needla-extending y.

throughfsaidi mntmember; said-.-nee :l-le having afprotuberance thereon: disposed gin. -said vrecess and 'adapted to; move inwardly in the--frecesswhen the needle is: moved. inwardly; and .r eleasable '-meanscnormallyc preventing@inwardf-movenrentg of' v the .protuberancei'n the recess.

3. A syringe; including av'rxarrel and @plunger frontmemberg-.thereom said; iront. member Ihaving an 'elongated recess',` .and-afi needle; Jexteifid-ing a. protuberance thereon; disposed; `-in- ;said--` recess and adapted to move inwardly in the recessgwhen one of said members having a diaphragm normally-closing communication from said one member to theneedle, the inner end of said needle being positionedto pierce said. diaphragmwhen through' said" fronti member; sa-id needle-'having the needle* fis.vr moved .,inwardlygagcap g member Yaboutzthe. needle'means, onthe .need-le engaging the cap memberrtocanse the :need-.1er to move with thecap member; .andemeansg onftherfronthmernber elongatedvrecesS-,t 31nd,?, f-needle extending tlfiroughasaidnfr'cntrmeniben; aidgneedle-havinga protuberance thereon disposedi-n.saidrecess and adaptedzfto: movefinwardly vvmythe recess :when the needle is moved-inwardly,facapfmernberabout the needle, meansgonwthe needle; engaging jthefeap member to cause; the needle-.g tof move; lwithy :the

cap member,u and; releasablemeans; normally-preventingfmovementpof thecap. member:` l 5*: A; syringe;v including-an outer ampule `member and an inner; plunger .mem-ber` slidable-in .the outer `member, fa.. front.' closure on1 one of said vmemo ers,4 said front closure. having -a Vrecess zvtherein, a needleJ extending throughsaid closureand having an-enlargement thereon; normallydisposedin the' recess, one; ofysa-id-members having a: diaphragm normally- 'closing .communication fromY saidone.Y member te` the needle, the. inner end of saidfneedle being positicned.to:r pierce said itszinward ,.posiv engaging .the hub .to cause the. habia-nd. needle to v.more.with; the cap.. memberand :displaceable theneedleis movedso thatlthe. enlargement is disposedinthe second axial. .recess,..and means normally preventing movement of., the needle.

7.. AY syringeincluding a barrel and a plunger movable in said barrel, said plunger. having a front, .memberl thereon, ,a needle extendinginto said front member, said needle.'.having. ,a..hub thereon, said needle..beingadapt ed .to .moyennywardiy 1n thefrontmember when the neiediehubis moyedinwardly, and displaceable means en.- gaging the front member. and the.-hub'and.nor mally preventing inwardr-novementi oi. thelneedle. s r8 syringe includingfa l.barrel and ,a plunger movable inv said .barrehv saidplungenhaving a pierceable front member'thereo'n, a needlefhaving :an inner end portion.. extending .into' said. front member, said needle having'a hub thereon,.said needle `being adapted to move inwardly in the front member topieree'. theV :front memberwhen the needle hub is moved inwardly, said...needle having. anouter endpcrtion. and lapap member surroundingtheneedlelouter end vportion"and eng-aging. the hun saidgcap`$ member being` shiftable. with.. Ythehuloftocause rv.rr-mvernent' of the hub, andneedle tol force Lthefneedle. through.. the `Vfrontfxjnember Vwhen the cap. memberis moved.

, 9. syringe including, abar-reLend a plunger .movableinlsaidbarrel, said ,plunger having a iront.. member. thereon, a'rnelevclleextend-ing into said, front member, saidf needle having.. a .hub

thereon'"s aic i needle being adapted .to move'inwardlyin thef`r.ont member to pierce thelfront membenwhen the needlehub. is moved. inwardly, a zcap member about, the. needlathe cap. .member A mea-HS disposedxbetween: the front 'member ,and

tlriehub, to. prevent'iorward.movement of the hub.

, u Y .sereine ns1/nre.

l The. following references are ofjzreg ile 7.0i thisfpa-.tenbg I j yUNITED:srzrrns Film1-rsf l Number Y 

